
import unittest
import user_code
import ast
import re   
import unittest
import importlib
import user_code

class TestTask(unittest.TestCase):
    def test_excludes_sensitive_keys(self):
        importlib.reload(user_code)
        details = {
            "ip": "10.0.0.1",
            "password": "secretpass",
            "ssn": "111-22-3333",
            "credit_card": "1234-5678-9012-3456",
            "secret": "do not log",
            "location": "CA"
        }
        result = user_code.log_user_action("u1", "test", details)
        _dynamic_test(
            self,
            "password" not in result and "ssn" not in result and "credit_card" not in result and "secret" not in result,
            "Sensitive keys are excluded from log message",
            f"Sensitive keys found in log message: {result}",
        )
        _dynamic_test(
            self,
            "ip" in result and "location" in result,
            "Non-sensitive keys are preserved in log message",
            f"Non-sensitive keys missing in log message: {result}",
        )

    def test_log_message_format(self):
        importlib.reload(user_code)
        details = {"foo": "bar"}
        user_id = "abc"
        action = "do"
        result = user_code.log_user_action(user_id, action, details)
        expected = f"User {user_id} performed action: {action} | Details: {{'foo': 'bar'}}"
        _dynamic_test(
            self,
            result == expected,
            "Log message matches expected format",
            f"Expected: {expected}, got: {result}",
        )

    def test_return_value_matches_log(self):
        importlib.reload(user_code)
        details = {"foo": "bar", "password": "baz"}
        user_id = "x"
        action = "log"
        result = user_code.log_user_action(user_id, action, details)
        _dynamic_test(
            self,
            isinstance(result, str),
            "Return value is a string",
            f"Return value is not string: {type(result)}",
        )
        _dynamic_test(
            self,
            "password" not in result,
            "Sensitive data not present in returned log message",
            f"Sensitive data present in returned log message: {result}",
        )

    def test_all_sensitive(self):
        importlib.reload(user_code)
        details = {"password": "a", "ssn": "b", "credit_card": "c", "secret": "d"}
        result = user_code.log_user_action("id", "act", details)
        _dynamic_test(
            self,
            "Details: {}" in result,
            "All sensitive details removed, empty dict in message",
            f"Expected empty details dict, got: {result}",
        )

    def test_all_non_sensitive(self):
        importlib.reload(user_code)
        details = {"foo": 1, "bar": 2}
        result = user_code.log_user_action("id2", "act2", details)
        _dynamic_test(
            self,
            "foo" in result and "bar" in result,
            "All non-sensitive details preserved",
            f"Expected keys 'foo' and 'bar' in result: {result}",
        )

def _dynamic_test(test_case, condition, success_message, failure_message):
    if condition:
        test_case._testMethodName = success_message
        test_case.assertTrue(True, success_message)
    else:
        test_case._testMethodName = failure_message
        test_case.fail(failure_message)

def normalize_text(text):
    text = text.lower()
    text = re.sub(r"\\s{2,}", " ", text)
    text = re.sub(r"\\s*([,:?])\\s*", r"\\1 ", text)
    return text.strip()

def change_var(code: str, var_name: str, value: str) -> str:
    tree = ast.parse(code)
    lines = code.splitlines()
    changed = False
    # Collect all assignment nodes to modify
    assign_nodes = [
        (i, node)
        for i, node in enumerate(tree.body)
        if isinstance(node, ast.Assign)
        and any(isinstance(target, ast.Name) and target.id == var_name for target in node.targets)
    ]

    # If nothing to change, return unmodified code
    if not assign_nodes:
        return code

    # Perform replacements for all matching assignments (from last to first to not break line offsets)
    for i, node in reversed(assign_nodes):
        start_line = node.lineno - 1
        line = lines[start_line]
        indent = ' ' * (len(line) - len(line.lstrip()))
        lines[start_line] = f"{indent}{var_name} = {value}"
        next_line = len(lines)
        for next_node in tree.body[i+1:]:
            if hasattr(next_node, 'lineno'):
                next_line = next_node.lineno - 1
                break
        if next_line > start_line + 1:
            lines[start_line+1:next_line] = []
        changed = True

    return '\\n'.join(lines) if changed else code

if __name__ == "__main__":
    unittest.main()


test_main.py

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Learn how to handle, store, and process sensitive data securely in Python applications.

Challenge: Secure Logging

Solution

Challenge: Secure Logging

Solution